Key Takeaways

• Our Trybello 2-in-1 Eyelash Growth Serum is the only dual-wand option, combining a growth serum and mascara in one product with a prostaglandin-free, plant-based formula.
• RapidLash relies on its proprietary HEXATEIN 1 Complex, which contains polypeptides and biotin, as well as isopropyl cloprostenate, a synthetic prostaglandin analog.
  
• Cosnori delivers the lowest upfront cost and a patented peptide blend with hyaluronic acid, though twice-daily application means faster product consumption.
• User reviews across all three serums praise gentle formulas and reduced lash fallout, though results timelines range from 4 weeks to 8 weeks, depending on the product.
• Trybello's 2-in-1 Eyelash Serum, which contains plant-based ingredients and comes with a 60-day money-back guarantee, is a standout choice for clean, convenient lash care with results you can see.

Finding the Right Lash Serum for Fuller, Healthier Lashes

Our Trybello lash serum, RapidLash, and Cosnori each take a distinct approach to lash growth, differing in price, active ingredients, prostaglandin status, and the speed at which users see results. This comparison breaks down all three so you can match a serum to your priorities, whether that's clean ingredients, budget, speed of results, or convenience.

We designed our 2-in-1 dual-wand to pair a pentapeptide-17-based growth serum on one end with a volumizing mascara on the other, using a plant-forward formula free from prostaglandins, hormones, silicones, and parabens.

RapidLash relies heavily on polypeptides and its proprietary HEXATEIN 1 Complex, though its formula also includes a synthetic prostaglandin analog. Cosnori takes a peptide-forward, conditioning-first approach, anchored by hyaluronic acid and copper tripeptide-1, with a gentle formula that matches the pH of human tears. Below, we compare cost, ingredients, and real user feedback across all three.

“100% Natural Serum Delivers Visibly Longer, Fuller Lashes in Just 30 Days. The Safe Alternative to Extensions!"

Transform your lashes naturally with our plant-based formula, free from oils, hormones, silicones, and harsh chemicals.

Proven Natural Ingredients

• • Panax Ginseng – Revitalizes follicles for accelerated growth
• • Pumpkin Seed Extract – Restores and strengthens lashes
• • Grape Seed Extract – Reduces breakage for fuller lashes

Clean Beauty You Can Trust

• • Gluten-free, fragrance-free, no parabens
• • Works on upper, lower lashes, and eyebrows

60-Day Guarantee: No results? 100% money back.

Get Trybello Eyelash Serum →

Trybello 2-in-1 Eyelash Growth Serum + Mascara Dual Wand

Trybello's dual wand combines a pentapeptide-17 growth serum with volumizing mascara for longer, stronger lashes in 4–8 weeks.

Our dual wand pairs a growth serum on one end with a volumizing mascara on the other, giving you long-term follicle nourishment and immediate cosmetic coverage in one product.

The serum's formula centers on pentapeptide-17, a keratin-stimulating peptide, which signals cells to ramp up keratin production, the structural protein that gives lashes their strength and length. The botanical side of the formula is where Trybello carves out its identity: Panax ginseng extract supports follicle circulation and revitalization, pumpkin seed extract delivers zinc and essential fatty acids for nourishment, and grape seed extract provides antioxidant protection against environmental damage. Biotin and panthenol handle the basics of reducing breakage and locking in moisture, while hyaluronic acid keeps the lash line hydrated. Swertia japonica extract, a less common inclusion, adds another layer of follicle-stimulating support.

The formula is prostaglandin-free and excludes oils, hormones, silicones, parabens, perfumes, and PEGs. We recommend applying once in the morning and as many times as needed during the day for the first two months for optimal results. Users typically report healthier, stronger lashes within the first four weeks, with visible fullness and length by weeks 4–8.

RapidLash Eyelash Enhancing Serum

RapidLash formulation includes its HEXATEIN 1 Complex, which contains polypeptides and biotin, as well as isopropyl cloprostenate, a synthetic prostaglandin analog. (Image courtesy of RapidLash)

RapidLash is built around its HEXATEIN 1 Complex, a proprietary blend of six active ingredients. The formula leans heavily on polypeptides, specifically Octapeptide-2 and sh-Polypeptide-1, to protect against lash breakage, while biotin supports structural integrity and panthenol locks in moisture. Soybean oil and pumpkin seed extract round out the complex with vitamins and minerals that help condition lashes over time.

Beyond the HEXATEIN blend, the formula also includes sodium hyaluronate for hydration and copper tripeptide-1, a well-researched peptide complex known for its antioxidant and skin-remodeling properties. The formula also contains isopropyl cloprostenate, a synthetic prostaglandin analog. The rest of the formula is paraben-free, fragrance-free, and cruelty-free.

Application is straightforward; one thin coat along the upper lash line before bed. RapidLash recommends about 8 weeks for noticeable results. A small number of users have reported mild eyelid itching, and RapidLash's own labeling warns of potential side effects, including eye redness, itching, dryness, darkening of the skin around the eye area, and, in rare cases, iris discoloration or orbital fat loss. The formula is generally well-tolerated, but users should review the full warning before use.

Cosnori Long Active Eyelash Serum

Cosnori's peptide-forward lash serum uses myristoyl pentapeptide-17 and copper tripeptide-1, and is prostaglandin-free, vegan, and tear-pH matched. (Image courtesy of Amazon)

Cosnori takes a peptide-forward approach. The formula is anchored by a patented peptide complex, and the supporting cast is strong: myristoyl pentapeptide-17 is known to stimulate keratin gene expression, which directly supports lash growth, while copper tripeptide-1 brings antioxidant and tissue-repair benefits.

These peptides do the heavy lifting on the growth and strengthening side. Sodium hyaluronate provides deep hydration. Portulaca oleracea extract adds omega-3 fatty acids and minerals, while houttuynia cordata extract contributes anti-inflammatory flavonoids. It's a thoughtful formula that prioritizes conditioning and lash resilience alongside growth.

The formula is prostaglandin-free, vegan, oil-free, and alcohol-free, and it's formulated at the same pH level as human tears to minimize irritation. Cosnori recommends twice-daily application (morning and evening) for at least one month, with the full lash growth cycle taking approximately 7–8 weeks.

Cost & Value Breakdown

Price matters, but so does how long a tube lasts and what you get for your money. Our lash serum is currently discounted to $29.95 (down from the regular price of $49.95) and adds meaningful value with its dual wand: you're getting a serum and mascara in one, which can replace a separate mascara purchase.

RapidLash at $34.95 for 3 mL is the most expensive per milliliter, though its once-daily application keeps consumption low. Cosnori offers the best upfront value at roughly $19–22, depending on the retailer, for 9g, but twice-daily application means you go through the product faster.

What Users Are Saying

Trybello Reviews

Our user base reports noticeable improvements in lash thickness and strength within the first month. On Trustpilot, customers praise the clean ingredient list and the absence of prostaglandins, meaning no risk of iris discoloration or periorbital fat loss. The dual wand format is a standout feature that reviewers frequently call convenient and time-saving.

RapidLash Reviews

Reviewers on LovelySkin and DermWarehouse consistently call RapidLash effective and affordable relative to prescription serums. Multiple users describe receiving compliments on their lashes after several weeks of use. The main drawback cited is the timeline; many users need a full 8 weeks before they see significant changes. A handful of reviews mention mild eyelid itching, though this is uncommon.

Cosnori Reviews

On iHerb, Cosnori earns strong marks for its non-irritating formula and lightweight texture. Users frequently highlight improvements in lash shine, elasticity, and reduced fallout. The innovative applicator tip gets regular praise. The most common criticism is that the serum strengthens and conditions lashes well, but may not deliver dramatic length gains.

RapidLash vs Cosnori vs Trybello: Comparison Table

Why Trybello Lash Serum Stands Out

Trybello's 2-in-1 lash serum combines growth and volume in one step. It is prostaglandin-free and backed by a 60-day guarantee.

We created our Trybello 2-in-1 Eyelash Growth Serum because we believe you shouldn't have to choose between instant coverage and long-term lash nourishment. Our dual-action wand gives you both in a single step: a growth serum on one end and a volumizing mascara on the other. No complicated routines, no extra products.

In our formula, we deliberately left out prostaglandins, hormones, silicones, parabens, and perfumes. This means no risk of iris discoloration or periorbital fat changes that can come with prostaglandin-based serums. It's gentle enough for sensitive eyes.

Over 100,000 customers trust Trybello, and as a US-based company, we stand behind every purchase with a 60-day trial guarantee. After 60 days of consistent use and your lashes haven't improved, you can apply for a full refund.

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Frequently Asked Questions (FAQs)